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4 years ago

How are conduction and convection and radiation different?

1 answer:

3 0

Well, conduction is when heat is directly transmitted through a substance.
Convection is the movement of a fluid that is caused by heat.
Radiation is the electromagnetic waves that cause heat.

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(1) Develop an equation that relates the rms voltage of a sine wave to its peak-to-peak voltage. a. If a sine wave has a peak-to

Aleks04 [339]

Answer:

(A) Equation will be $v=v_msin\omega t=0.75sin(18840t)$

(B) RMS value of voltage will be 0.530 volt

Explanation:

We have given peak to peak voltage of ac wave = 1.5 volt

Peak to peak voltage of ac wave is equal to 2 times of peak voltage

So $2v_{peak}=1.5volt$

$v_{peak}=\frac{1.5}{2}=0.75volt$

Frequency of ac wave is given f = 3 kHz

So angular frequency $\omega =2\pi f$ = 2×3.14×3000 = 18840 rad/sec

So expression of equation will be $v=v_msin\omega t=0.75sin(18840t)$ ( As phase difference is 0 )

Now we have to find the rms value of voltage

So rms voltage will be equal to $v_{rms}=\frac{v_{peak}}{\sqrt{2}}=\frac{0.75}{1.414}=0.530volt$

4 0

3 years ago

Rain that tends to fall in bands on earth is caused by which of the following?

dem82 [27]

Rain that tends to fall in bands on earth is usually caused by : Warm, moist air rising and cooling
First, the water on earth evaporate due to sun's heat and formed cloud. Later on, this water condensed and fall again on the earth. Completing the water cycle

hope this helps

4 0

3 years ago

Read 2 more answers

An object is 2.0 cm from a double convex lens with a focal length of 1.5 cm. Calculate the image distance

Tomtit [17]

Answer:

0.857 cm

Explanation:

We are given that:

The focal length for a convex lens to be (f) = 1.5cm

The object distance (u) = - 2.0 cm

We are to determine the image distance (v) = ??? cm

By applying the lens formula:

$\dfrac{1}{f} = \dfrac{1}{u}+\dfrac{1}{v}$

By rearrangement and making (v) the subject of the above formula:

$v = \dfrac{uf}{u-f}$

replacing the given values:

$v = \dfrac{(-2.0)(1.5)}{(-2.0 -1.5)}$

$v = \dfrac{-3.0}{(-3.5)}$

v = 0.857 cm

3 0

3 years ago

Which is the best term to describe a chemical reaction in which the reactants have less potential energy than the products?

bezimeni [28]

Answer:

C.endothermic

Explanation:

chemical reactions

6 0

3 years ago

Which of the following is true regarding momentum?

kakasveta [241]

Increasing the mass of an object increases its momentum.

Explanation:

Momentum of an object is measured as the quantity of motion done by the object.
It is calculated using the formula, p = m × v where m is mass of the object and v is the velocity of the object.
As momentum and mass vary proportionally, as seen in the formula, increasing the mass of an object will also increase its momentum.

8 0

3 years ago